Counterintuitive dispersion violating Kramers-Kronig relations in gain slabs.
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We demonstrate the counterintuitive dispersion effect that the peaks (dips) in the gain spectrum correspond to abnormal (normal) dispersion, contrary to the usual Kramers-Kronig point of view. This effect may also lead to two unique features: a broadband abnormal dispersion region and an observable Hartman effect. These results are explained in terms of interference and boundary effects. Finally, two experiments are proposed for the potential experimental verification.
author list (cited authors)
Wang, L., Wang, L., Al-Amri, M., Zhu, S., & Zubairy, M. S.
complete list of authors
Wang, Li-Gang||Wang, Lin||Al-Amri, M||Zhu, Shi-Yao||Zubairy, M Suhail